Erdfernerkundung - Numerische Physik: Modellierung

276 KAPITEL 5. DIE ERWEITERTE PERSPEKTIVE: CAWSES
Abbildung 5.43: variation in ozone
(top) and temperature (bottom) at
75N following a large solar energetic
particle event during a magnetic field
reversal (based on [226])
§ 914 The simulation in Fig. 5.43 can be regarded as a first indication for a solar energetic
particle induced modification of the climate. The model atmosphere used to obtain that
result has been build primarily for the study of atmospheric chemistry. The model is a 2D
model only, that is it considers the vertical coordinate and latitude as horizontal coordinate
because the relevant transport processes in the atmosphere are meridional. In consequence,
atmospheric circulation can not be treated self-consistently. Instead, it is parameterized such
that only the meridional component is allowed to vary while the azimuthal transport is
fixed. Such a model cannot adjust completely to a different temperature pattern driving the
circulation systems. Thus the results in Fig. 5.43 give an indication only.
§ 915 Within the framework of CAWSES it is planned to use the MPI Hamburg model HAM-
MONIA (http://www.mpimet.mpg.de/en/depts/dep1/uma/hammonia/) to model possible
consequences of precipitating solar energetic particles for climate in more detail. It should
be noted that this implies a large amount of computational resources. Thus the simple first
estimate in Fig. 5.43 has been relevant in such that it has confirmed that the process under
study is possible and worth further investigation. Without such a preliminary study it would
have been irresponsible to start the study with the full climate model.
2. Juli 2008 c○ M.-B. Kallenrode